BUT, thanks to the encouragement of friends, I have a wearable shawl. My (and Denise's) most heartfelt thanks go to Cindy the Super Shawl Saver. Cindy gave me permission to do what no knitter ever should, and what I had never even considered (because I'm such a proper knitter, y'know), and because of that, I could tackle the holes.
Eight of them. Yes, I know I said 5 or 6 ... but eight holes got mended. The cause, near as I can figure, was wetting, blocking, wetting, and .... whoosh ... 16 strands parted like roving while getting gently squeezed. ('Scuse me while I go put my newly mended shawl into a colander so it can safely drip damp).
The shawl is laying upstairs to dry now. I am not blocking this under tension, ever. I saw plenty of roving-esque spots that are holding together by neighborly love and kindness, and I have no wish to go through the past 48 hours again.
It's done.